In this review, I use Emmons and McCullough's excellent volume on gratitude as a platform for discussing several issues in emotion,cultural, and moral psychology. First I summarize this exceptionally rich edited book, which provides accessible reviews of the philosophy,theology, anthropology, sociology, evolutionary biology, and psychology of gratitude. I next take up four questions inspired by the book. First, I consider whether gratitude is an emotion, and how to operationally define emotions. Second, I discuss the cognitive components of gratitude, including the appraisal structure of gratitude and whether gratitude can occur without an attribution. Third, I take up the question of whether gratitude is indeed a positive emotion, and propose some complications in the nature of positive emotions. Last, I consider potential sources of individual, cultural, and religious differences in gratitude, such as whether gratitude is mostly about internal feelings or the fulfillment of social obligations.Psychology has typically viewed emotions as internal experiences that were selected for because they enhance the fitness of the individual experiencing them. But more recently, psychology has come to realize the importance of emotions that orient our concerns away from our own, narrow interests to the interests of others. While these emotions are no doubt also relevant to the individual's fitness, they can also be seen more broadly and in a more social, moral, and self-transcendent context. It is probably a confluence of several factors that promoted this broadening of interest (Emmons, 2004).